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Young-Min Kim,Isaias Inacio Quizito Afonso,Hochang Jang,Jeonghwan Lee 한국공업화학회 2020 Journal of Industrial and Engineering Chemistry Vol.82 No.-
This paper presents a new methodology to apply a kinetic hydrate inhibitor (KHI) to prevent hydrateplugging considering the system availability of the topside system in an offshore gas platform. Theproposed methodology comprises three steps: the system availability analysis by Monte Carlosimulation, subsea multiphaseflow simulation to evaluate the risk of hydrate plugging, and application ofKHI to prevent hydrate plugging. The topside system availability and its longest downtime wereestimated to be 99.3% and 47 h, respectively. As a result of the multiphaseflow simulation, thetemperature in theflowline decreases from 40 C to 5 C during the system downtime, creating thecondition for hydrate formation. Thus, polyvinylcaprolactam (PVCap) was used to delay hydrate pluggingfor a period longer than the cooldown time. As a result, the injection rate of 0.75 wt% of PVCap wasrequired 0.6 times per year to prevent hydrate plugging, while 30 wt% of mono ethylene glycol (MEG) wasrequired under the same hydrate formation condition. This approach provides the guideline for KHIinjection according to the system downtime andflowing performance in subsea gasflowline as a riskmanagement strategy to mitigate operation risks in the offshore gas platform.